Audition times can vary between places, so definitely look that up. If they expect you to bring a whole Beethoven sonata, a major romantic work, an etude, etc and your playing time is only 15 minutes, they will ask you to play one movement (they pick), a part of the longer work, etc.
I played the Medtner Sonata Reminiscenza exposition until the start of the development, the first movement of a Mozart sonata (they freaked me out by asking me to play the 3rd movement which I hadn't focused on but I was allowed to play the 1st one instead) and an Etude on one audition, for example.